Stitch-forming mechanism for sewing-machines.



A. H. DE VOE.

STITCH FORMING MECHANISM FORSEWING MACHINES.

APPLICATION FILED NOV. 30. 1915.

Patented 0013. 8, 1918.

2 SHEET.SSHEET I.

WITH/E8858: INI/ENTOR f6. 85mm M 7 amigo By A. H. DE VO E.

STITCH FORMING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED NOV. 30,1915.

Patented Oct-.8,1918.

2 SHEETS-SHEET 2.

WITNESSES. l/V VE IV TOR I By 7%, I

' A TTORIVEY UNiTEn STATES PA E T oFmo BE H- DEvon'oF-W smmw,N ERS Y;ASS GKQRX Q H 'IueEaMAurrno'run ve COMPANY, nooR PoRnTIoN on NEW JERSEY.

STITCH-FORMING MECHANISM FOR SEWING-MACHINES.

Specification bf Letters I-atent. P t t ppli ioncfiledN v mbs 51215. ea1; i. 21-

To allwhom it may concerni Beit known that I1, ALBERT H.\DIQ You,

a citizen of the United States, residing at W stfield, in h county ofUni n a d State of New Jersey, have invented certain new and usefulImprovements in Stitch-Forming Mechanism for SewingMachines, of; whichthe following isa specification, reference being had thereintotheaccompanying drawings. V i

This invention has for its object to pro vide means for layingone ormore threads across the; path of a: plurality of needles in theformationof a cross thread stitch similar to that illustrated inthepatent toiBer ger No. 1,060,5 2 6, of Apri-l.29, 1913.

In the aforesaid patent .two cQiiperative implements are employed forlaying the cross threads in front of the path of the needles, each.implement being carriedby a; rocker having a link connection, withsecond rocker fulcrumed upon the headofthesewing machine and givenOperative movements from a cranksstud onthe oscillatory actu= atingshaft by meansof a 'pitman. 1 The two rockers which serve as carriersfor the thread laying implements are pivotally mounted on thepresser-bar, so; that it is necessary to provide two distinct, universallink conneca tions. between; them and the rocker mounted on the frame. I

By means of the present improvement all of the driving. members 01; thethread laying implements; are mounted directly upon the presser-bar withthe exception of a; slid, ing drivingconnection on the needle-baraetuating shaft; Furthermore theearrienior one implement receives"motion. from its oscillatory supporting shaft-and trianemits mo tiondirectly to itscornpanionimplement car-, rier, thusreducing-the-numberofi parts; to a minimum. I

e pr v ments e applied. o; h machine provided with the usualreciproeatory needle-bar mounted in the head of therover hanging-armparallel withan endwise movable presser-ban Clampediupon the presserbarnear its lower end-is thecollarlof an arm which supports a dependingvertical stud afiording a, pivotal; support for a short rocking carrierarm. for one: of the thread lay: ing implements-.- The presser-bar-isformed with anaperture extending axially thereof to. receive anoscillatory shaft provided at its lower end with a T arm, one branch ofthe said, arm senving as a-carrier-fpr the sec} d read l ng mp m an he1: branch a gm being connected; with and serving t v-ttans t a mi kingmo ion; o the o m 01 m' e z- The; pp r ends ofith o c ll o y shaft h siampe e eonveni peltulzed crank arm whieh is actuated through a slid: ngconn t n w t icrankr t n h a e at ng sha fi Wh n the pr s e an' S-elevated to raise thepresser-foot above the Work, he h a n a ing; mp ementnd al i h diiv gir s erefon are b ly l edwlth the bar without disturbingtheir 7 relative positions, I

In the drawings, Figure 1 1s a v partly sec- Qf-wn e e at on of. a machie em od ing the improvements, and Fig. 2 is afront nd; elev t on, hereoh t e. f e-p a i the ll t k fire ei,la sl d,- the: P e ser-bar being:hQWIl F m ly n ec iq -z E gw per pe tive ew of 1 est tQ onm nsk d hre deey ngme ha m ig- & is a etai ew he t r ad y 11 mp ments. he r carriersand. centain, other connected parts; an E g- 5 s a Pe spe t v v ew h nghe stitch and the mannerin which. the thread laying implements.cooperate in fonningathe same. j w v I. Y

T .e-imPtMWHt e, b di d n a m k i e on t uc e i th he ual ba eLhd- 10wandardh d ubula ve ha ing rm 3; inthe head 4 oi which isj ournaled thevert callxpnoe t ng ne d er 5' pr v ded,

in he-xpne stanc with. th mult pleusual: link 1/1- with a rearwardly;projecting stud; arried the o lar xedupo need-lat r athmug hi h co e tns he needles receive their operative movements from the rocleshaft 11,The needle-actuatingi wok-shaft has fixed upon its; rearward end collarwith oppositely extending crank arms 16 and 17, the former of which isconwith the rearwardly extending arm 20 of an' elbow-lever mounted uponthe transverse fulcrum-pin 21 and having an upwardly extending arm 22connected by means of the pitman 23 with the rocking looper-carrier 24,upon which are secured the lower-thread carrying'looper 25 and adjacentneedle-guard 26.

f Fixed upon the main-shaft is thefeedactuating eccentric 27 embracedbythe strap 28 of an eccentric-rod connected with the feed-rocker 29which is journaled upon the fulcrum-pin 30 and has pivotally connectedthereto'th'e rearward end of the feed-bar 31 carrying the feed-dog 32.The main-shaft has fixed thereon'the feed-lifting eccentric 33 uponwhich is fitted the slide-block '34 embraced by the depending yoke 35 ofthe feed-bar 31 by means of. which rising and falling movements areimparted to the feeddog32.- 7

Journaled'in the head of the overhanging arm and parallel Withthefneedle bar is the presser-bar 36 having clamped thereon near itslower end by means of the screw'37 the split collar of a bracket 38having a depending arm 39 embraced by the shank 40 of the presser-foot41, a set-screw 42 serving to holdthe shank in position. The bracket 38is formed with a lateral arm 38 apertured to receive a depending stud 43serving as a pivotal support for a rocking carrier 44, the lower wall ofthe carrier restingupon the head 42 on-the stud 43, the stud being seecured in position upon the bracket-arm 38 by means of a'set-screw 45.Carrier 44 is 1 provided near its free end With a vertical apertureadapted to receive the shank 0t of the thread laying implement a whichis secured in adjusted position by means of the set-screw 46." Thesecond thread-laying implement b is provided with a carrier so 'arrangedthat its movements are utilized to transmit motion to its companioncarrier 44, in the manner now to be described. t

Fitted within an aperture 0 formed axially s of the presser-bar, is anoscillatory shaft 47 which projects below the collar of bracket 38 andon which is secured by means of the setscrew 48 a radial-armed carrier49,the arm 0 of the carrier being'apertured near its end toreceive theshank b of thread laying implement b, the latter being secured inadjusted position by means of the set-screw-50. The second arm at of thecarrier 49 is utilized asa crank member to transmit motion to rock-arm44, and therefore carrier 44 is proyided with an open slot or recess' 51which receives the end of'carrier arm 21, a pin 52 The second crank-arinserving as apivotal connection between the two. s V

The presser-bar is formed in two sections,

the upper section 3o being connected to the lower section by means of aconnector f. The connector is provided with upper and lowersleevesseparated by a cut-away portion 53% "The lower section of the presserbaris clamped within the lower sleeve 53 of the connector and the uppersection 36* of the presser-bar is reduced in diameter to snugly fit intothe reduced diameter of the upper connector sleeve 54 which alsoreceives the upper end of the oscillatory shaft 47 as shown in Fig. 2.""Clamped upon that portion of oscillatory shaft 47 exposed by theintermediate cutaway portion 53 of connector f is the splitcollar 56 ofa horizontally disposed crank arm 57 formed with a depending socketmember 58 forming a part of a sliding connection between a crank-disk onthe actuating shaft and the oscillating shaft 47. The socket, member 58receives a slide-pin 59 formed with an apertured cross-head 59 embracingcrank-stud 60 on the collar 12 fixed upon the actuating shaft. 1 In thearcuate movement of crank-stud 60 pin 59 will have a slight idlemovement within the socket 58 to permit a dwell of the thread layingimplements to hold the cross thread or threads in position during thedescent of the needles and until the latter reach the work, andsubsequently will be swung bodily back and forth by the oscillationof'the actuating shaft to impart a corresponding backward and forwardmovement of the thread laying implements in the repositioning of thecross-thread.

Having thus set forth the'nature of the invention, what I claim hereinis 1, In a sewing machine, the combination with stitch-formingmechanism, of an endwise-movable supporting-bar, and a threadcarriermounted to oscillate thereon, a second thread-carrier operativelyconnected with the first named thread-carrier, an oscillatory shaftcarried by said bar and affording an axial support for the secondthreadcarrier, an d means for imparting operative movements to the saidoscillatory shaft.

2. In a sewing machine, the combination with stitch-forming mechanism,of a supporting-bar formed with an axial aperture and a thread carriermounted to oscillate thereon, a second thread-carrier operativelyconnected with the first named thread-carrier, an oscillatory shaftfitted within the aperture of the said bar and affording an axialsupport for the second thread-carrier, and means for imparting operativemovements to the said oscillatory shaft.

" 3. 111 a sewing machine, the combination withstitch-forming mechanism,of means for laying the thread in front of the needle or needlescomprising a thread-carrier, an oscillatory shaft alfording an axialsupport for the thread-carrier, an apertured crankarm carried by saidoscillatory shaft, a rock shaft and a crank-stud carried thereby, and Va slide-pin fitted Within the aperture of the crank-arm and having asleeve embracing the said crank-stud.

4:. In a sewing machine, the combination with an actuating shaft andstitcheforming mechanism including a plurality of needles and means forreciprocating the same, of a Presser-bar formed with an axial aperture,a shaft fitted to oscillate within the said aperture, a thread-carryingimplement adapted. to lay thread across the path of the needles, arocking carrier for the said implement, supported upon the oscillatoryshaft,

, and a pin-and-socket sliding connection'between the said oscillatoryshaft and the said actuating shaft.

5. In stitch-forming mechanism for sewing machines, the combination witha plu rality of reciprocatory needles of a presser- 7 bar formed with anaxial aperture, an oscillatory shaft fitted Within the aperture of thepresser-bar, a thread carrying implement, a rocking carrier for the saidimplement mounted on the lower end of the oscillatory shaft, a crank-armcarried by the oscillatory shaft at its upper end and formed with asocket, a pin slidingly fitted within saidsocket and provided with anapertured crosshead, a rock-shaft 'operatively connected with theneedles, and a crank-stud mounted upon the said shaft and embraced bythe apertured cross-head of the sliding pin,

6. In stitch-forming mechanism for sewing machines, the combination witha plu- Copies of this patent may be obtained for rality of needles andmeans for reciprocating the same, of a thread-carrying'implement, anoscillatory shaft, a rocking carrier fixed. upon said shaft and formedwith an arm, a thread laying implement supported by the carrier, asecond thread laying implement and a rocking carrier therefor, an

; operative connection between the latter carrier and the arm of thefirst carrier, and

means for imparting operative movements to the said oscillatory shaft.

7. In a sewing machine, the combination with a bed and an armoverhanging the same, of an actuating shaft supported by said arm, aneedle-bar mounted in the head of the arm and operatively connected withthe actuating shaft, an oscillatory shaft mounted in the head parallelwith the needle-bar, a thread laying implement carried by the saidoscillatory shaft, a crank-arm on the said oscillatory' shaft, acrank-stud on the actuating shaft, and a sliding driving connectionbetween the crank-arm and stud.

8. In a sewing machine, the combination ALBERT H. DEv VOE.

five cents each, by addressing the Commissioner of IPatents, Washington,I). C.

